I own the Yamaha NS-15 speakers and I bring them in and out of my system. I did a lot of searching on the web for information and there is not much there. What I learned was that Yamaha did not have a Speaker for the home market in the 60's so as a stop gap, used their electric piano's "ear" speaker in an open baffle format combined with a JA-5505 Aluminium Tweeter. There were many evolutions of this basic designs. The NS-15 seems very close to the NS-250, the former having a broader ownership.
The crossover is extremely simple and some have recommended that the woofer should not be limited and to just replace the tweeter's caps and eliminate the Woofer's caps.
They are very very efficient at 98 db, so the Yamahas are perfect for triode amps. I have removed the front and rear covers. I have them placed well away from the back wall, and I pair them with a set of subs.
They do sound very interesting, piano sounds very realistic and alive.
Being an open baffle design, they create a gorgeous sense of depth.
Eventually, Yamaha dropped the design and developed a speaker
with a more traditional cabinet leading to their power house
Yamaha NS-1000 speaker with it's beryllium drivers.
One of my caps is leaking, so I intend on implementing a newer modified crossover with a tweeter recap and the woofer bypass. Due to Yamaha's research in developing the JA-3501 woofer for their musical instruments, this speaker represents a unique value decades later at current used prices.
The crossover is extremely simple and some have recommended that the woofer should not be limited and to just replace the tweeter's caps and eliminate the Woofer's caps.
They are very very efficient at 98 db, so the Yamahas are perfect for triode amps. I have removed the front and rear covers. I have them placed well away from the back wall, and I pair them with a set of subs.
They do sound very interesting, piano sounds very realistic and alive.
Being an open baffle design, they create a gorgeous sense of depth.
Eventually, Yamaha dropped the design and developed a speaker
with a more traditional cabinet leading to their power house
Yamaha NS-1000 speaker with it's beryllium drivers.
One of my caps is leaking, so I intend on implementing a newer modified crossover with a tweeter recap and the woofer bypass. Due to Yamaha's research in developing the JA-3501 woofer for their musical instruments, this speaker represents a unique value decades later at current used prices.